Statisticsmedium · Past Paper
In a cumulative frequency table, if the less-than cumulative frequency for the class 20-30 is 45 and for 30-40 is 60, what is the frequency of the class 30-40?
A15
B45
C60
D105
✓ Correct Answer: A — 15
Frequency of a class = CF of that class - CF of the preceding class. 60 - 45 = 15.
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